Maintenance; General Recommendations; Hoses; Constant-Torque Hose Clamps On Coolant Lines -Volvo D13 - PREVOST H3-41 Maintenance Manual

SECTION 05b: X3 SERIES COOLING SYSTEM

3. MAINTENANCE

3.1 GENERAL RECOMMENDATIONS

A systematic routine inspection of cooling
system components is essential to ensure
maximum engine and heating system efficiency.
•
Check coolant level in the surge tank daily,
and correct if required. Test antifreeze
strength.
•
Check belts for proper tension; adjust as
necessary and replace any frayed or badly
worn belts.
•
Check radiator cores for leaks and make
sure the cores are not clogged with dirt or
insects. To avoid damaging the fins, clean
cores with a low-pressure air hose. Steam
clean if required.
•
Inspect the water pump operation. A leaky
pump sucks in air, increasing corrosion.
•
Repair all leaks promptly. Unrepaired leaks
can lead to trouble. Inspect and tighten
radiator mounts
replace thermostat regularly.
NOTE
In order to ensure the integrity of the system, it
is recommended that a periodic cooling system
pressure check be made. Pressurize the
cooling system to 103-138 kPa (15-20 psi)
using Radiator and Cooling System Tester,
J24460-1. Do not exceed 138 kPa (20 psi).
Any measurable drop in pressure may indicate
a leak. Whenever the oil pan is removed, the
cooling system should be pressure checked as
a means of identifying any incipient coolant
leaks. Make sure the cause of the internal leak
has been corrected
contaminated system.
Leaks at the thermostat
connections may be caused by deformation of
connections or by rough surfaces on the castings
of the hose mounting surfaces. It is recommended
that "Dow Corning RTV-102 Compound" or any
equivalent product be applied on cast surfaces
prior to hose installation.
CAUTION
Castings should be clean and free of oil and
grease before applying compound. No other
sealer should be
compound.
10
PA1615 Maintenance Manual All Series
periodically. Test and
before flushing the
housing hose
used with RTV-102
|
Section 05b revised September 2016
NOTE
For additional information concerning Volvo
D13 engine components or engine-related
components, consult Volvo Trucks Canada or
Volvo Trucks North America Web Site under:
Parts & Service. On Volvo web site, you will
find detailed service procedures for parts
replacement, repair and maintenance.

4. HOSES

Rotten, swollen, and worn out hoses or loose
connections are frequent causes of cooling
system problems.
Serious overheating is often caused by an old
hose collapsing or from rotten rubber shedding
from hoses and clogging the coolant passages.
Connections should be inspected periodically
and hose clamps tightened. Replace any hose
found to be cracked or swollen.
When installing a new hose, clean pipe
connections and apply a thin layer of a
non-hardening sealing compound. Replace worn
out clamps or clamps that pinch hoses.
4.1 CONSTANT-TORQUE HOSE CLAMPS ON
COOLANT LINES –VOLVO D13
All hose clamps of 1 3/8" ID and over, used on
the heating and cooling systems, are of the
"Constant-torque"
type.
worm-driven, made of stainless steel, and
supplied with a series of Belleville spring
washers. They also feature an extended integral
liner that covers the band slots to protect
soft/silicone hoses from damage, and help
maintain consistent sealing pressure.
This type of clamp is designed to automatically
adjust its diameter to compensate for the normal
expansion/contraction of a hose and metal
connection that occurs during vehicle operation
and shutdown. The constant-torque clamp
virtually eliminates coolant losses due to "Cold
flow" leakage and greatly minimizes clamp
maintenance.
These clamps are